<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    {% block title %}
    <title>这是母版页</title>
    {% endblock %}
</head>
<body>
<table border="1" style="width: 700px">
        <tr>
            <td colspan="2" >{% include '3/top.html' %}</td>
        </tr>
        <tr style="vertical-align:middle;height:300px">
            <td style="width:200px">这是左边菜单</td>
            <td style="width:500px">
                {% block content %}
                    这个区域随着内容页的变化而变化
                {% endblock %}
            </td>
        </tr>
        <tr>
            <td colspan="2" style="height:30px;text-align:center;">
                {% include '3/footer.html' %}
            </td>
        </tr>
    </table>
</body>
</html>